Send unique bot emails per user

1. Ability to grant sudo in development environment
2. Fix from fields of email addresses to be unique per community user

Tries to fix #186 
We'll likely want some other admin features down the line. Instead of special casing these specific routes, I think we should have an admin namespace and a sudo controller. This will become something like:

```ruby
namespace :admin do
  if Rails.env.development?
    get 'sudo' => 'sudo#sudo'
    post 'sudo' => 'sudo#grant_sudo'
  end
end
```

The sudo methods would then live inside `app/controllers/admin/sudo_controller.rb`. That controller could inherit from an `AdminController` which requires that `current_user` be an admin in a before filter.